RSA-129
RSA-129, having 129 decimal digits (426 bits), was not part of the 1991 RSA Factoring Challenge, but rather related to Martin Gardner's column in the August 1977 issue of Scientific American.
RSA-129 was factored in April 1994 by a team led by Derek Atkins, Michael Graff, Arjen K. Lenstra and Paul Leyland, using approximately 1600 computers from around 600 volunteers connected over the Internet. A US$100 token prize was awarded by RSA Security for the factorization, which was donated to the Free Software Foundation.
The value and factorization is as follows:
RSA-129 = 11438162575788886766923577997614661201021829672124236256256184293 5706935245733897830597123563958705058989075147599290026879543541 RSA-129 = 3490529510847650949147849619903898133417764638493387843990820577 × 32769132993266709549961988190834461413177642967992942539798288533The factorization was found using the Multiple Polynomial Quadratic Sieve algorithm.
The factoring challenge included a message encrypted with RSA-129. When decrypted using the factorization the message was revealed to be "The Magic Words are Squeamish Ossifrage".
Read more about this topic: RSA Numbers